Spraying device



June 29 1926. 1,590,430 P. ERBY SPRAYING DEVICE FiledDeo. 22. 1922 ATTORNEY hose. Packing 17 is provided to Eatented June 29, 1926.

UNITED STATES PHILIP ERBY, 0F CHICAGO, IILINOIS.

SPBAY'ING DEVICE.

Application led December 22, 1922. Serial No. 608,399.

The invention` relates to spraying devices and more particularly to those used lfor 'spraying paint or similar material. One ob- ]ect of the invention is to provide a spray gun which comprises a reservoir to contain the material to be sprayed and in which provision is made for subjectin the material to air pressure to cause it to ow uniformly from the nozzle. Other objects of the invention will appear from the specication.

The drawing is a section of a device embodying the invention.

The invention is exemplified in a structure comprising a head 1, a cylindrical body 2 secured to said head by screws 3", a handle 4 removably secured to the lower end of the cylinder 2 by thumb-screws 5, a piston 6, to which a cup-shaped packing 7 is secured by a ring 8 which is slidable in the cylindrical body 2. The cylindrical body and head 1 form the reservoir which is adapted to contain a supply of paint or other material to be sprayed and the piston 6 is adapted to apply pressure to the body of material in the reservoir to force it through the vaporizing devices. The head 1 is provided with a filling plug 9. Piston 6 is fixed to the upper end of a stem `10 which is slidable in a cylinder 11 formed in the handle 4. A nipple 12 is formed on the lower end of the handle for couplin the handle to a hose connected to a supp y of air under pressure. A check-valve 13 1s provided in the lower end of the handle, is held normally closed by a spring 14'and isadapted to control the delivery of air under pressure to the handle. A stem 15, whichis slidably mounted in a screw 16, is adapted to force valve 13 from its seat against the force of spring 14 to control the supply of air fronthe air-supply revent the escape of air around wire 15. lever 18, pivoted at 19 to the handle 4, is adapted to operate wire 15. This lever extends longitudinally of the handle so that the operator may conveniently grip it and control the spray while moving t e gun over surfaces to be sprayed. The lower end of cylinder 11 is in communication with the air-duct 18 in the lower portion of the handle, so that while valve 13 is open, air will'enter said cylinder to subject the lower end of stem 10 to pressure and cause the piston 6 to exert suicient pressure .against the material in the reservoir to discharge it from the reservoir. The stem 10 is of considerably of cap less area than the piston 6 so that the material will not be subjected to the-high pressure used for spraying.

A duct 20, formed in the handle 4, is connected by a hollow screw 21 to a pipe 22 which is disposed outside of the reservoir and has its upper end connected to a casing 40 which is removably secured in head 1 by a screw-thread 41 and this pipe delivers air under pressure from the handle'to a duct 23 in casingy 40 which delivers the air into a chamber 24. A cap 25 is screw-threaded to a'laterally extending boss 26 on the cas- I ing 40. A plug 27, having a central opening 28, is screwhreaded into the outer end 25. A nozzle 29 is disposed in opening 28 to deliver the material from the reservoir to said opening through which air under pressure is discharged. Air under pressure passes to the opening 28 from chamber 24 through a duct 30 formed in cap 25. Nozzle 29 is provided with an enlarged portion 31 having tapered ends which are seated in and clampedbetween the inner end of boss 26 and the cap 25. A needle valve 32 is provided to regulate the delivery of the material to the nozzle. A check-valve 33 is held normally closed against a seat 34 in a casing 35 by a spring 36. Said casing is screw-threaded into the casing 40 and is disposed in a pockety 37 formed in the head. The purpose of the check-valve is to prevent the material from flowing out of the reservoir, except when the piston 6 is subjected to air pressure.

The operation will be as follows: Assuming the reservoir to be full of paint and the cap 9 closed, the operator holding the handle 4can manipulate the nozzle over the surface to be treated and, with the fingers of the hand supporting the gun, will press lever 18 inwardly. When the lever is operated inwardly, wire 15 will unseat valve 13 and admit air under pressure into cylinder 11 where it will act upon the lower end of stem 10 to put the material inthe reservoir under suiiicient pressure to cause it to open check-valve 33 and feed it past the needle valve 32 and through the constricted discharge orifice in the nozzle 29.4

Simultaneously,

The invention exemplifies a cup-gun or' one in which a reservoir for a supply of materialk is operable with the nozzle, in which the material is subjected to pressure to forcibly discharge it through the nozzle.

Also a device of this character in which the'- supply of air for putting the material under pressure is conjointly controlled with the air for atomizing the material at the discharge nozzle. The reservoir may be readily refilled upon removal of the plug 9. The check-valve 33 cuts off the delivery of the material from the reservoir when the air pressure is discontinued. The parts can be readily taken apart for cleaning. The nozzle 29 is removably' held and automatically centered in plug 27.

The invention is not to be understood as restricted to the details set forth, since these may be modified within the scope of the appended claims, Without departing from the spirit and scope of the invention.

Having thus described the invention, what I claim as new and desire to secure by Letters Patent, is:

l. A spray-gun comprising a portable reservoir, means on the reservoir whereby it may be manipulated, a spraying device supported on and movable with the reservoir, means for supplying air under pressure to the spraying device, a piston engaging the material in said reservoir for exerting pressure upon the material to forcibly discharge'it therefrom and means for applying constant pressure to the piston.

2. A spray-gun comprising a portable reservoir, a handle on the reservoir, a spraying device supported on and movable with the reservoir, means for supplying air under pressure to the spraying device, a piston in the reservoir, means to apply constant pressure against the piston to forcibly discharge the material, and a controlling device for the air mounted on the handle.

3. A spray-gun comprising a portable reservoir, means on the reservoir whereby it may be manipulated, a spraying device supported on and movable with the reservoir, and means for supplying air to the Spraying device to vaporize the material, and a piston operated by air under pressure to subject the material in the reservoir to pressure to discharge it.

A. A spray gun comprising a portable reservoir, a handle on the reservoir, a spraying device supported on and movable with the reservoir, means for supplying air to the spraying device to vaporize the material, a piston operated by air under pressure for subjecting the material in the reservoir to pressure, and means on the handle for conjointly controlling the air to said device and to operate the piston.

5. A spray-gun comprising a portable reservoir, means on the reservoir whereby it may be manipulated, a spraying device supported on and movable with the reservoir,

a piston in said reservoir, means for delivering air under pressure to said device for spraying the material, and means to deliver air under pressure to the piston to force the material from the reservoir. y

6. A spray gun comprising a portable reservoir, a handle `on the reservoir, a spraying device supported on andmovable with the reservoir, a piston in said reservoir provided with a stem of relatively small area, means for delivering air under pressure to said device for spraying the material, and means to deliver air under pressure to said stem to operate the piston and force the material from the reservoir.

7. A spray gun comprising a portable reservoir, a handle on the reservoir, a spraying device supported on and movable with the reservoir pressure operated means in the reservoir for forcing the material therefrom, means for delivering air into said device to spray the material, and an automatically closing valve to retain the material in the reservoir when the forcing means is not subjected to pressure.

8. A spray gun comprising a portable reservoir, a handle on the reservoir, a spraying device supported on and movable with sai reservoir, a pressureioperated piston in the reservoir for forcing the material therefrom, means for delivering air to said device to spray the material, and an automatically closing valve to retain the material in the reservoir when the pressure on the piston is released.

9. A spray gun comprising a portable reservoir, a handle on the reservoir, a spraying device supported on and movabley with the reservoir, a piston in said reservoir having a reduced stem slidable in and extending longitudinally of the handle, means for delivering air under pressure to said device for spraying the material, and means to deliver air under pressure to said stem to operate the piston-and force the material from the reservoir.

10. A spray gun comprising a portable reservoir, a handle on the reservoir, a spraying device supported on and movable with the reservoir, a piston in the reservoir for forcing the material therefrom provided with a reduced stem slidable in the handle, means to deliver air to said device to spray the material, and to said stem for subjecting the iston to pressure and a valve for controlling the supply of air to said device and to said piston and a lever.

l1. A sprayy gun comprising a portable reservoir, a handle on the reservoir, a spraying device supported on and movable wlth the reservoir, a piston in the reservoir for forcing the material therefrom provided with a reduced stem slidable in the handle, means to deliver air to said device to s ray the material and to said stem for subjectlas ing the piston to pressure, a valve for controlling the supply of air to said device and to said piston, and a, lever extending lengthwise of the handle for operating the valve.

l2. A spray gun comprising a portable reservoir, a handle on the reservoir, means for putting the material inthe reservoir under pressure, a casing, a, cap for the casing,

PHILIP ERBY. 

